by Kastro
Paper/Archive/CVE-2026-20079

CVE-2026-20079

Cisco Cisco Secure Firewall Management Center (FMC) — Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability

KEV · due 12 SepEPSS 88%public exploitSSVC actCVSS 10.0
critical.is priorityof 100
100
CVSS 10.0 (CNA)10.0 / 10 × 3030.0In CISA KEV+3030.0EPSS percentile 99.8.998 × 2020.0Exploit: SSVC active+1010.0SSVC exploitation: active+1010.0
Description · from the CVE record

A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.  This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device. 

Affected

ProductAffectedFixed inSource
Cisco Secure Firewall Management Center (FMC)7.0.0–CNA
Cisco Secure Firewall Management Center (FMC)7.0.0.1–CNA
Cisco Secure Firewall Management Center (FMC)7.0.1–CNA
Cisco Secure Firewall Management Center (FMC)7.1.0–CNA
Cisco Secure Firewall Management Center (FMC)7.0.1.1–CNA
Cisco Secure Firewall Management Center (FMC)7.1.0.1–CNA
Cisco Secure Firewall Management Center (FMC)7.0.2–CNA
Cisco Secure Firewall Management Center (FMC)7.2.0–CNA
Cisco Secure Firewall Management Center (FMC)7.0.2.1–CNA
Cisco Secure Firewall Management Center (FMC)7.0.3–CNA
Cisco Secure Firewall Management Center (FMC)7.1.0.2–CNA
Cisco Secure Firewall Management Center (FMC)7.2.0.1–CNA

Scores by source

cisco (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: active · Automatable: yes · Technical impact: total

References

refsec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2writeupblog.talosintelligence.com/fmc-ongoing-exploitationrefcisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20079refseclists.org/fulldisclosure/2026/Aug/80kevcisa.gov/known-exploited-vulnerabilities-catalog